Confirmed, I just witnessed it happen. A bot flew over an ocean with an uncommon biter egg, it hatched in mid air and created an uncommon Jesus biter

I found a deconstruction planner set to never remove landfill would ignore that instruction if the planner is used twice over an area containing concrete placed on landfill. On the second placement it will flag the landfill under the concrete for removal.

To reproduce;

1) Make a custom ...